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Re: 71 K20 gearbox, transfer case and rear diff questions
For transmissions the folks at Novak have been great to me. I have rebuilt 2 SM420's with their parts, no complaints, nothing to return. Plus their web site is a wealth of knowledge that is rare these days.
https://www.novak-adapt.com
Good luck.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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